Double window testing device



FIG. 1 is a front plane view of the double window testing device of the instant invention;

FIG. 2 is a rear plane view thereof;

FIG. 3 is a top end view thereof;

FIG. 4 is a bottom end view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a left side view thereof. 

The ornamental design for a double window testing device, as shown and described. 